Pump



F. FRELIN March 21, 1933.

PUMP

INVENTOIR. afFne Jan BY 5% Hi5 ATTORNEY TIM Patented Mar. 21, 1933 UNITED STATES PATENT OFFICE FBITJ'OF FRELIN, OF PHILLIPSBURG, NEW JERSEY, ,-.ASSIGNOE '1'0 INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A. CORPORATION OF NEW JERSEY- Application filed March 18, 1931. Serial No. 523,439.

This invention relates to pumps, but more particularly to a gear pump adapted to be driven by a reversible drive shaft.

One object of the invention is to assure uni-directional rotation of the pump gears 1rrespective of the direction of rotation of the drive shaft.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference characters refer to similar part-s,

pump constructed in accordance with the practice of the invention, and

Figures 2 and 3 are transverse views taken through Figure 1 on the lines 2-2 and 33 looking in the direction indicated by the arrows? Referring more particularly to the drawing,- A and B designate generally a gear pump and its casing respectively. The casingB illustrated comprises a hollow member C having therein a pump chamber D which is closed-at its opposite ends by heads E and Seated upon the head'E'isla second hollow f member G, the'interior of which constitutes a gear chamber'H" and on the'outer end of the hollow member G is arranged a cover plate J. The parts comprising the casing may be secured in the operative position in any suitable and convenient manner, as for instance, by means of bolts or rods K.

On opposite sides of the hollow member C are inlet and outlet openings L and 0 respectively, and within the chamber 1) are a pair of gears P and Q which intermesh and are adapted to convey fluid from the inlet opening L to the outlet opening 0. The gear P is provided with trunnions R and S which are journalled in the heads F and Erespectively to assure the proper operative position of said gear, while the gear Q, is provided with a central bore T through which extends a drive shaft U. Preferably the drive shaft U, or the portion V of the shaft which lies within the bore T, is of somewhat greater diameter than the adjacent portions of the shaft and which portions. may be conveniently j ournalled in the heads F and E.

It is within the contemplation of the invention that the drive shaft U be connected ,to a reversible prime mover, as for instance,

such as fuel or lubricating oil in the samedirection in order to avoid the use of a multiplicity of pump passages and intricate flow controlling devices. .To that end the shaft Figure 1 is a sectional elevation of a gear U is provided with a suitable clutch device consisting in this instance of a plurality of balls WV disposed in a recess X in the enlarged portion V of the shaft U and in such wise that, upon rotation of the shaft U in one direction, the said balls W will be clamped between the wall of the bore T and an eccentric surface Y which forms the bottom of the recess X.

To the end that a reverse movement of the shaft U may be transmitted and translated tothe gears P and Q, to assure a uni-directional rotation of said gears, the said shaft and within the recess f are disposed clutch members, such as balls 9, which are adapted to be clamped between the gear 6 and the bottom 72. of the recess 7.

Theoperation of the device is as follows:

rotated in .a counterclockwise direction and l which may be the normal direction of rotaing the clutch members or balls W will be clamped between the surface Y and the gear Q to lock these elements securely together. The gear Q, will then rotate with the shaft, and being intermeshed with the gear P will cause the gear P to be rotated inan opposite hand direction so that the fluid entrapped be- Let it be assumed that the shaft U is being 9 tween the teeth of the gears P and Q will be carried from the inlet opening L to the outlet opening 0 in a well understood manner. Upon reversal of the prime mover, and consequently of the shaft U, the'ballsW will be released, thus disconnecting the shaft U Y from the gear Q,. Upon rotation of the shaft in this direction the balls 9 will be wedged between the surfacek of the recess f and the gear I) which will then. be fixedly secured to the shaft. The movement of the gear I) will be transmitted through the idler gear 0 to the gear (2. The latter gear being affixed to the gear P will drive the said gear P in the same direction in which it previously rotated during the counter movement of the drive shaft U. Being intermeshed with the gear P the gear Q, will therefore, of course, also be rotated in the direction necessary for delivering fluid from the inlet opening L to the outlet opening 0. The gear Q, will then rotate freely on the drive shaft U which will then merely act as a bearing for the said gear Q.

I claim:

A pump comprising a' casing having a pump chamber and a gear chamber, a pair of intermeshing pump gears in the pump chamber, an extension on one pump gear and extending into the gear chamber, a reversible drive shaft in the chambers and extending loosely through one pump gear, a gear train in the gear chamber comprising a gear mounted loosely upon the drive shaft and another gear keyed to the extension, an idler gear intermeshing with the gears in the gear chamber to transmit the movement of one gear to another, and a pair of automatically acting clutch devices in the drive shaft, one of said clutch devices being adapted to connect the drive shaft to one gear upon rotation of the drive-shaft in one direction and the other clutch device being adapted to connect the drive shaft to the othergear'upon rotation of the drive shaft in another direction.

In testimony, whereof I have signed this specification.

FRITJ OF FRELIN. 

